As snacks: Cut-up fruit makes a great snack. Either cut them yourself, or buy pre-cut packages of fruit pieces . Or, try whole fresh berries or grapes.
Dried fruits also make a great snack. They are easy to carry and store well. Because they are dried, ¼ cup is equivalent to ½ cup of other fruits.
Frozen juice bars (100% juice) make healthy alternatives to high-fat snacks.